单项选择题

Which of the following advisors within the Oracle advisory framework will analyze a single SQL statement and make recommendations for performance improvement?（）

A. SQL Repair Advisor
B. SQL Optimizer
C. SQL Access Advisor
D. SQL Tuning Advisor

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单项选择题
Which of the following advisors within the Oracle advisory framework will analyze a single SQL statement and make recommendations for performance improvement?（）

A. SQL Repair Advisor
B. SQL Optimizer
C. SQL Access Advisor
D. SQL Tuning Advisor
单项选择题
What is the correct order of the following commands if you wanted to restore datafile 4， which was accidentally removed from the file system？（）   a. sql ’alter database datafile 4 online’ b. restore datafile 4 c. recover datafile 4  d. sql ’alter database datafile 4 offline’ e. startup  f. shutdown

A. a， c， b， d
B. d， b， c， a
C. f， d， b， c， a， e
D. c， a， b， d， f
E. a， b， d， e
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